How many movies have Kazuya Hisada and Tadayoshi Yamamuro collaborated on?

They have worked on 7 movies together! Their first movie together was Dragon Ball Z: The World's Strongest (1990) while their highest rated movie together was Dragon Ball Z: Bardock - The Father of Goku (1990). They have not worked together since Dragon Ball: The Path to Power (1996). They are most known for their animation films together.